Number vs Quantity

When to use each in English, with meaning, register, and examples.

Number

Top 1,000 (very common)A1noun

Quantity

Top 2,000 (common)A2noun
Most common: Number
 NumberQuantity
Pronunciation🇬🇧 /["/ˈnʌmbə(r)/"]/🇺🇸 /["/ˈnʌmbər/"]/🇬🇧 //ˈkwɒntɪti//🇺🇸 //ˈkwɑːntɪti//
MeaningA number is a word or symbol that represents a quantity.How much of something there is.
ExampleHe called the number on the advertisement to get more information.I bought a large quantity of apples.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)
CEFR levelA1A2
Part of speechnounnoun
Collocationsthree-digit, 16-digit, cardinal, calculate, add, add together, in round numbers, number crunching, fax, phone, telephone, call, dial, phone, be busy, be engaged, be unobtainable, exchange numbers, somebody’s name and number, big, high, low, grow in, increase in, decrease in, go up, grow, increase, in number, number of, a decline in numbers, a drop in numbers, a growth in numbers, big, high, low, grow in, increase in, decrease in, go up, grow, increase, in number, number of, a decline in numbers, a drop in numbers, a growth in numberslarge quantity, small quantity, limited quantity, significant quantity, exact quantity
Antonymsnonequality
Common mistakesConfusing 'number' with 'amount' (use 'number' for countable items, 'amount' for uncountable), Saying 'the number of less people' instead of 'fewer people', Using 'numbers' when referring to a singular 'number'Confusing 'quantity' with 'quality'., Using 'quantity' where 'amount' is more appropriate (e.g., uncountable situations).
Usage notesUse 'number' when referring to a specific quantity of things. It's appropriate in both spoken and written contexts, though in formal settings, specify further (e.g., 'number of participants'). Avoid using it in highly technical mathematical discussions where specific numerical terms are preferred.Used in contexts relating to amounts, measurements, or counts. Common in both spoken and written English.

Frequently asked questions: Number vs Quantity

What's the difference between Number and Quantity?

Number: A number is a word or symbol that represents a quantity. Quantity: How much of something there is.

Which is more common: Number and Quantity?

Number is the most common in everyday English.

Are Number and Quantity the same CEFR level?

Number: A1, Quantity: A2 on the CEFR scale.

Can I use Number and Quantity interchangeably?

Not always. Number and Quantity are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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